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NAT and TF on WAN - Strange Behaviour - Printable Version +- Ewon Technical Forum (https://techforum.ewon.biz) +-- Forum: Development (https://techforum.ewon.biz/forum-50.html) +--- Forum: Ewon Embedded Technology (https://techforum.ewon.biz/forum-51.html) +---- Forum: Ewon Internet Connectivity (https://techforum.ewon.biz/forum-5.html) +---- Thread: NAT and TF on WAN - Strange Behaviour (/thread-2711.html) |
NAT and TF on WAN - Strange Behaviour - tolis - 30-01-2025 Hi all, we noticed the following behaviour : We have a Flexy EWON installed on a plant and that allows remote access to local devices on the network. On site there is a Siemens PLC (s7-1500), a Siemens HMI PC with WinCC Runtime Advanced (OS is Windows 10) and several other devices . Initially we have set the EWON as Plug and Route NAT on LAN (Natltf=3). The client then decide to allow Internet access via the Siemens HMI PC and we have achieved that via NAT and TF on WAN Routing option (Natltf=2). Since we have done that , we can still monitor and program the PLC remotely, we can still access the local devices and we can still access the HMI via VNC. However, we are unable to download any modifications to the HMI PC. To get around this we have to keep switching the routing back to Natltf=3 , do the download and then switch back to Natltf=2. In a nutshell: if Natltf=3 : PLC can be accessed and downloaded, various LAN network devices can be accesses, HMI can accesses for monitoring via VNC, HMI program can be downloaded. If Natltf=2 : PLC can be accessed and downloaded, various LAN network devices can be accesses, HMI can accesses for monitoring via VNC, HMI program cannot be downloaded. The PLC, the HMI PC and the various local devices are using as gateway the IP address of the EWON. Also, the above was checked with the same outcome when the Firewalls were disabled on HMI PC. Has anyone came across the above behaviour? Are we missing something. Any clues or assistance will be much appreciated. Thank you. |